Developing Facial Symmetry Using an Intraoral Device: A Case Report

Transcription

1 Developing Facial Symmetry Using an Intraoral Device: A Case Report by Theodore R. Belfor, D.D.S.; and G. Dave Singh, D.D.Sc., Ph.D., B.D.S. Dr. Theodore Belfor graduated from New York University College of Dentistry in 1966, after which he served as a Brigade Dental Surgeon, 196th Lt. Infantry, Chu Lai, Vietnam. He holds diplomas from numerous organizations, including the American Society for Dental Aesthetics and the Branemark Institute for Osseointegration. He has lectured in the United States, Puerto Rico, and India; and has been published in Anti-Aging and Cosmetic Surgery Magazine. Dr. Belfor, who once served as the dental director of American Healthcare Ltd., in Beijing, China, currently practices general dentistry in New York City. Dr. G. Dave Singh is a professor at the Center for Craniofacial Disorders at the University of Puerto Rico School of Medicine in San Juan. He leads an NIH-funded program of craniofacial research, which uses advanced imaging technologies to model clinical treatments and craniofacial anomalies. Dr. Singh, who was born, educated, and trained in England, has published extensively in peer-reviewed dental and orthodontic journals and has developed geometric morphometric software for 3-D and 2-D analyses. He is a member of the American Association of Orthodontists and the Appliance Therapy Practitioners Association. Note: Dr. Belfor and Dr. Singh developed and have a U.S. Patent pending on the Homeoblock appliance, the device described in this article. ABSTRACT This case report introduces a new intraoral device, the Homeoblock appliance (Orthovisage Inc; New York, NY), which produces cosmetic facial enhancement without an invasive procedure. Furthermore, this particular case demonstrates widening of the arch form and smile, and reduction of the buccal corridor without reducing tooth structure. Indeed, robust geometric analysis was undertaken to confirm the clinical findings, which localized and quantified the facial regions in which changes produced by the intraoral device were identifiable. This new intraoral protocol may be used in cosmetic dental practice as an alternative to surgery or other invasive procedures to enhance facial esthetics. This report demonstrates that an intraoral device can also produce significant facial changes, with increased symmetry and, presumably, facial volume, in the adult. 80 The Journal of Cosmetic Dentistry Summer 2004 Volume 20 Number 2

2 CASE REPORT This case study reports facial changes that are consistent with increased facial symmetry and, perhaps, facial volume. A 38-year-old male with no relevant negative medical history requested treatment to improve his smile. On examination it was found that the upper arch was crowded, with an absence of the second bicuspids and the lateral incisors in a cross-bite relationship. Extraoral and intraoral photographs, as well as panoramic and cephalometric radiographs, showed no adverse findings. Alginate impressions were taken for study models and a Homeoblock device was fabricated. The device consisted of Adam s clasps on the first molars, a palatal expansion screw, a Hawley labial bow from cuspid to cuspid, flap springs for the anterior teeth, and a bite block on the left (Fig 1). On insertion, the patient was instructed to wear the appliance every evening and throughout the night. Once a week the expansion screw was advanced by one full turn (= 0.25 mm), which is about half the width of the periodontal ligament space. The patient reported for clinical adjustments and observation every three weeks; intraoral photographs were taken at each visit. The active treatment time was approximately 24 months, after which a retainer was provided. At the end of active treatment, extraoral and intraoral photographs were taken, as well as alginate impressions for study models. The extraoral facial photographs were assessed for morphometric changes, using MorphoStudio software ( (Fig 2). These changes included an increased symmetry of the eyes and the upper lip (Fig 3), and the reduction of the nasolabial groove on the left side of the face after treatment with the Homeoblock appliance. Figure 4 demonstrates the widening of the smile and reduction of the buccal corridors, which was achieved without any reduction of tooth enamel. Thus, the upper arch increased in symmetry, and the alignment of the anterior teeth was significantly improved (Fig 5). Changes in facial appearance were also assessed using geometric morphometrics. The changes in the face were captured graphically (Fig 6), indicating a 30% increase in local size extending from the lateral canthus of the right eye to the angle of the mandible, and extending across the nasal and oral regions. A similar increase was found extending from the angle of the mandible across the face on the left side, allied with a 15% decrease in size from the left philtral crest to the oral commissure on that side. In contrast, a 30% increase in relative size was localized in the mental region, using the pseudocolor scale. Other regions of the face, colored green, indicated areas where no increase or decrease in local size was identifiable. These pseudo-color changes indicate an esthetic increase of the buccal corridors. by remodeling the maxilla and mandible using a functional device, dentists can widen the smile and provide enough room to align teeth in adult Class I and Class II malocclusions. DISCUSSION This case report indicates facial changes achieved through the use of a non-surgical functional appliance, which indicates that dentists may be able to alter facial appearances using this new protocol. The idea of using dental appliances is not new; the first removable dental appliances date back to the 1880s. Kingsley 1 RESULTS Clinically, it was evident that changes occurred not only in the dental arch but also on the face Figure 1: The Homeoblock appliance. Volume 20 Number 2 Summer 2004 The Journal of Cosmetic Dentistry 81

3 2a: Facial appearance prior to treatment. Note the asymmetry of the eyes and the upper lip, and the prominence of the nasolabial groove on the left side. Figure 2 2b: Facial appearance after treatment with the Homeoblock appliance. Clinically, it is evident that changes occur, increasing the symmetry of the eyes, the upper lip, and the nasolabial groove on the left side. 3a 3b Figure 3 3a: The appearance of the lips before treatment. Note the asymmetry and uneven plane between oral commissures, as well as the depression of the nasolabial groove. 3b: Approximately 16 months after insertion; note the increase in symmetry of the lips and less prominent nasolabial grooves, as well as leveling of the plane between the oral commissures. 3c 3c: Approximately 24 months after insertion; note the improved nasolabial appearance and enhanced symmetry of the lips. 82 The Journal of Cosmetic Dentistry Summer 2004 Volume 20 Number 2

4 4a: The appearance of the smile before treatment. Figure 4 4b: The appearance of the smile after treatment with the Homeoblock appliance. Note the widening of the smile and reduction of the buccal corridors, which was achieved without any reduction of tooth enamel. 5a 5b Figure 5 5a: The form of the upper arch prior to treatment. Note that the lateral incisors are excluded from the arch and are in cross-bite. 5b: The changes in form of the upper arch after nine months of treatment with the Homeoblock appliance. 5c: The changes in form of the upper arch after 22 months of treatment. 5d: The form of the upper arch after 24 months (completion of active treatment). Note that the lateral incisors have moved into the arch and are no longer in cross-bite. 5c 5d Volume 20 Number 2 Summer 2004 The Journal of Cosmetic Dentistry 83

5 Figure 6: Graphic using geometric morphometrics (finite-element analysis) 6,7 to compare facial form before and after treatment. reported on the treatment of oral deformities and irregularities using removable functional appliances. Similarly, Haupl and colleagues. 2 employed functional therapy, using intraoral devices and the muscles of mastication. More recently, orthopedic correction of condylar hypoplasia using a functional appliance was reported, 3 producing remarkable changes in facial morphology in a patient diagnosed with hemifacial microsomia. In less severe cases, clinical dental practitioners have been using functional appliances (such as Hawley appliances) for many years with good orthodontic results. This report demonstrates that an intraoral device can also produce significant facial changes, with increased symmetry and, presumably, facial vol- ume, in the adult. This notion is consistent with the functional matrix hypothesis in a developing face, 4,5 as bone remodels in response to functional stimuli. We can therefore hypothesize that altering the occlusal function and muscle action in adult patients, not only in children, may also produce facial changes. Clinically, Class I and Class II malocclusions exhibit narrow maxillary and mandibular arches with crowded teeth, producing a narrow smile with dark buccal corridors. This case suggests that by remodeling the maxilla and mandible using a functional device, dentists can widen the smile and provide enough room to align teeth in adult Class I and Class II malocclusions. Simultaneously, this remodeling provides a better anatomical relationship between the teeth and their supporting structures. Accordingly, crowns and laminates can be applied with better proportion and symmetry, resulting in an enhanced cosmetic outcome. As the crowns and laminates are no longer required to correct the anatomical insufficiency of rotated teeth, their use can be more adeptly redirected to the achievement of optimal surface appearance. We are planning further studies based upon a larger sample of adult patients to substantiate the preliminary findings reported here. References 1. Kingsley NW. Oral Deformities. A Treatise on Oral Deformities as a Branch of Mechanical Surgery (pp ). New York: D. Appleton Century Co.; Haupl K, Grossman WJ, Clarkson P. Textbook of Functional Jaw Orthopedics (pp ). London: Henry Kimpton; Sidiropoulou S, Antoniades K, Kolokithas G. Orthopedically induced condylar growth in a patient with hemifacial microsomia. Cleft Palate Craniofac J 40(6):645-50, Moss ML. The functional matrix hypothesis revisited. 1. The role of mechanotransduction. Am J Orthod Dentofacial Orthop 112(1):8-11, Singh, GD. On growth and treatment: The spatial matrix hypothesis. In: McNamara JA Jr. (ed). Growth and Treatment. Craniofacial Growth Series (Monograph 41). Ann Arbor, MI: University of Michigan Press; Singh GD, Clark WJ. Localization of mandibular changes in patients with Class II division 1 malocclusions treated using Twin Block appliances: Finite-element modeling. Am J Orthod Dentofac Orthop 119(4): , Singh GD, Clark WJ. Soft tissue morphometry of subjects with Class II division 1 malocclusions treated using Twin Block appliances: Finite-element scaling analysis. Euro J Orthod 25(3): , The Journal of Cosmetic Dentistry Summer 2004 Volume 20 Number 2